The Taliban launched a coordinated suicide attack in a key provincial capital on Sunday in the insurgency's latest major operation.

KABUL — The Taliban launched a coordinated suicide attack in a key provincial capital on Sunday, killing four officers of Afghanistan's domestic intelligence service and injuring many civilians in the insurgency's latest major operation.

Sunday's violence came a day after the Pakistani government announced it had released seven Afghan Taliban prisoners, a move aimed at helping revive the stalled peace process in Afghanistan.